﻿// Jinx AJAX Framework
// Copyright (C) 2008 Blake Hegerle
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

using Jinx.Naming;

namespace Jinx.Bindings.Observation
{
    internal class BoundValueObserverNode : ObserverNode
    {
        private readonly IBinding Binding;

        internal BoundValueObserverNode(BindingContext BindingContext, IBinding Binding)
            : base(Binding.Path, BindingContext)
        {
            this.Binding = Binding;
        }

        internal override void Update()
        {
            try
            {
                var Value = Resolver.Resolve(Path);

                if (Value == null)
                    Binding.Invalidated();
                else
                    Binding.ValueApplied(Value);
            }
            catch (CouldNotResolvePath)
            {
                Binding.Invalidated();
            }
        }

        internal override void Invalidate()
        {
            Binding.Invalidated();
        }
    }
}